Planing machine provided with fixed knives drawers



July-8, 1930. c. .1. A. JOHNSON 1,770,106

PLANING MACHINE PROVIDED WITH FIXED KNIVES DRAWERS Filed June 20, 1927 6 01% Jo msan 07 mm TOK Patented July 8, 1930 was rTEs.

PATENT oFFicEjq" CARL JOHAN AXEL JOHNSON, or s'rooni ronrvr,.swnnnn, assrenoaro J. a c, e. 'BOLIN- nnns MEKANISKA vnnnsrnns anrrnnonae, or STOCKHOLM, swnnnn, A consona- TH N PLANING MACHINE PROVIDED WITH FIXED-KNIVES DRAWERS Application filed June 20, 1927, Serial No.

In planinginachinesprovided with fixedknives drawers, each planing knife in the drawer or the drawers cooperates with spring actuated pressure rollers, which during the planing operation bear on that side of the 'wood material which is opposed to that of the planing knives, and keep such material pressed against the working plane, particularly near the cutting edges of the knives, in front of the same. The rollers are mounted in spring actuated spindles adapted to be displaced in beams which, in turn, are spring loaded at or near their ends, so that the beams will be acted upon, together with the rollers, in a direction against the drawers.

In order to make it possible to adapt the roller pressure on each one of the rollers either uniformly or in some other way, in accordance with different widths of material, the spring loads must be accurately adjusted at or near the ends of the beams. This adjustment requires great practice and may often be connected with difi'iculty, so much more so as readjustments are not infrequently required. Consequently, removal of a drawer for regrindingor readjustment of the planing knife cannot be eifected, without the pressure rollers being relieved, that is to say, the beam with the rollers must be removed from the drawer, which generally cannot take place, without the springs adaptedto actuate the beam being relieved. When the rollers are then to be set anew, the springs have to be readjusted with respect to the tension.

The present invention provides anarrangement, through which all such readjustment is dispensed with.

The invention is principally characterized by the fact that the beam carrying the pressure roller or rollers corresponding to a planing knife in the knife drawer is connected, in order to be moved in a direction toward or from the drawer, with a gearing so devised that the beam can be moved by the same in the manner set forth, in parallel to itself, that is to say, in such a manner that on approaching the beam to the drawer or on removing the same therefrom, all of the pres sure rollers will be set in the same degree in 200,211, an in Sweden March 23, 1927.

a direction against the drawer, or be relieved to the same extent ma direction from the drawer. Therefore, no adjustment of the position of the beam per so need be reckoned with.

tached to one and the same shaft adapted to be turned by means of a lever or the like. Thus, thebeam can be moved in parallel to itself simply by turning the shaft,-while it is being actuated by its spring load which, in the formof a single spring, need only be provided at the one end of the beam.

In addition, the invention comprises an arrangement by means of 'which the whole group of pressure rollers can be removed from the-drawer or the drawers, without the adjustment of the spring load on the beams having-t0 be altered.

The accompanying drawings illustrate an embodiment of the invention disclosed by wayof example. Fig. 1 shows the apparatus viewed from the side of the planing machine, Fig. 2 the arrangement viewed in the longitudinal direction of the machine, and 3 dies 3 adapted to be displaced up and down in beams 4. According to Fig. 2, each beam carries two. pressure rollers or pairs of rollers 2, and according to Fig. 1, three such beams are provided, corresponding to three planing knives situated therebeneath and attached in one and the same drawer or each in a separate drawer. Attached to the ends of each beam are toothed racks 5 cooperating with pinions 6 secured on a common shaft 7 having alever 8 attached to the outer end thereof. Provided at the one end of the beam 4 is a spring 9 inserted between the beam and a support 10 which also serves as a guide cured in the frame of the machine;

for the'spindle 11 attached to the beam, said spindle having the spring 9 threaded-there- V on. Screwed onto thenpper threaded end of the-spindlell is a nut23 WhlChYSGIVGS as an abutment to prevent the beam from being lowered underneathv a certain 11m1t, for 1nstance, when afspace L1s produced between the ends of two boardsfed the one after the 7 other, into which space the rollers 2 may sink down.

If either one of the beams; to be raised with its pressure rollers 2, it' is only necessary that the corresponding lever She swung upwards, as shownin Figs. 1 and 2, the pinions 6 then uniformly actuating theracks 5 and also raising the beam uniformly at every pointalong the whole of its length.

"The beamis locked inits raised position 7 bymeans of a cotter which is loosely threaded througha transversal opening in the shaft 7 and adapted tofallinto arecess inthe-hub 13. Whenthe'beam is thus raised,.tl ie spring [9 is compressedfand when byreleasingthe I cotter 12 the beam will again become free for being'lowered, it is actuated for such lowering by the spring 9, the lowering then taking "place uniformly along the whole length of the beam, which is also efl'ected throughthe 'medium of the toothed racks 5 and the pin- ;ions6. f

' The'franoe '14 carrying all of the beams at,

the shafts 7 and thepressure rollers 2, is displaceahle up and down on four posts 15 se, The upper "portions of these posts areformed into screws having'nuts 16 adapted to be'screwed V thereon, said nuts being rotatable in the frame'l l-and formed into worm wheels 17 cooperating with worms 18attaohed to shafts 19. Both of these shafts'are in driving connection with each other through the medium the planing machine comprising screw threaded posts mounted on the planlng ma chine in parallel spaced relation, nut members mounted on said frame and rotatably secured to said frame, and means to simultaneously rotate'said nut members to move the same up or down said posts whereby the frame, the beams and the rollers can beadjusted towards and from said knives, substantially as and for thepurposes set forth.

2. In a planingmachine as claimed in claim knives, pressure rollers for said knives, beams supporting. said rollers,means for mounting said beams onsaid frame comprising braclr ets on said frame, spindles secured to sald beamsslidahly mounted in said brackets,

spring-son said spindles interposed between said beamsand said brackets, and means to selectively move the beams relatlvely to the frame comprising toothed racks secured to the ends of the beams, pinions engaging said racks, shafts in said frame supporting pinions which are common to the racks of each beam, means to rotate said shafts, and spring means for mounting said rollers on said beams, said-spring means being of a lower ca )acit than the sarin s mountin the y e V a:

beams on the frame.

In testimony whereof I affix my signature.

CARL J OHAN AXEL JOHNSON.

of a chain 20 and sprocket wheels 21. At

tachedto'th'e one shaft 19 is the handwheel 22. lVhen this wheel is turned, all of the nuts 17 arertu rned' by the same amount, and

the whole frame 14, together with the parts "mounted therein.,is'raised and lowered uniformly, that is to say in such a manner that readjustment ofthe pressure action of the separate pressure rollers is not required. Setting or reheving of thepressure rollers in accordance with differentthicknesses of material can thus be effected without adj ustment of the pressure action of the pressure rollers,

7 What Iclaim is':

1. A planing machine provided with fixed said beams, toothed racks rigidly connected "atthe ends of each beam, shafts journalled in saidjframe, pinions on said shafts and en- Y gaglngsaid racks for controlhng the vertical movement ofthe beamsin the frame and meansfor'adjustably-securing the frame to knives, pressure rollers for said knives, beams supporting sa d rollers, a frame supporting 

